In November 2018 Google released v5 of the PageSpeed Insights tool. It was a major change as under the hood it switched to using Lighthouse for all its audits and scoring.

In July 2018 we introduced Lighthouse audits and scores to SpeedCurve so we'll soon be deprecating and removing the old v4 PageSpeed score.

If you haven't already you should update any performance budgets to use the "Lighthouse Performance" score. 

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